Consulting Rooms Pvt Ltd — GSTIN number of Buyer not mentioned in GST INVOICE given to me

Dear Sir, I have purchased a Sony Bravia 43 inch TV from Flipkart through seller Consulting Rooms Pvt Ltd CIN U74900DL2016PTC291626. I had specifically demanded for GST INVOICE and I had given my GSTIN number as well. But My GSTIN number is not mentioned in Tax Invoice. Request you to attend the matter at the earliest.